APARIAN A-DNP3R, Руководство пользователя

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DNP3 Operation
Document No. D109-010 Page 68 of 108
Revision 1.15
Function Description
Select/Operate The select/operate function is a two-step operate where the Master first “Arms” the
outputs with the select function before enabling the “Armed” output with the operate
function.
Direct-Operate The Direct-Operate function has a similar outcome to the Select/Operate function but
is a one-step function. Thus the outputs are “Armed” and executed in the same
function.
Direct-Operate with
no response The Direct-Operate with no response function is similar to the Direct-Operate but does
not require an acknowledgement that the operation has been executed.
Table 5.1 – Select/Operate, Direct-operate, and Direct-Operate no reponse functions
The DNP3 Router uses a
RequestPending bit in the Logix UDTs (refer to the example code for
provided UDTs) to inform the user that either an operate request has been received (Reactive
Tag Mode) or that an operate request must be executed (Scheduled Tag Mode).
NOTE : When the DNP3 Router is in Scheduled Tag Mode command functions
will only be executed once the RequestPending bit has been set. Once the
command has executed the bit will automatically be cleared. So set
RequestPending bit only after all other values have been set.
An example of a UDT with the
RequestPending bit is shown below:
Figure 5.5 – UDT for operate commands
5.2.1. R
ECEIVING
O
UTPUT
C
OMMANDS
The Outstation DNP3 Router requires two items to be mapped for each Binary or Analog
Output Command. The first being the Command (Group 12 or Group 41) and the second the
Output Status (Group 10 or Group 40).